Breath flow meter



FIG. 1 is a left side quarter perspective view of a breath flow meter having the design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a front elevation view thereof; and,

FIG. 7 is a rear elevation view thereof.

The broken lines in the figures illustrate unclaimed environment only and form no part of the claimed design. 

CLAIM The ornamental design for a breath flow meter, as shown and described. 